单词拼写。（共10小题，每小题1分，满分10分）
小题1:Many teenagers are                 (疯狂的) about online games.
小题2:They have tried all sorts of                  (治疗) for her disease but without success.
小题3:Police suspect there may be a                 (联系)between the two murders.
小题4:With this extra evidence he was able to                   (宣布) with certainty that polluted water carried the virus.
小题5:The volunteers                   (贡献) huge amounts of their time to the project.
小题6:Our children                   (参加) the same school.
小题7:It is a pity that the industrial cities built in the nineteenth century do not            
（吸引）visitors.
小题8:How many groups are the students in your class               (把…分成) into?
小题9:She                (折叠) the letter and put it into the envelop.
小题10:This is a mixture                   (由…构成) of flour and water.